I want to erase everything on my SD card and use it when I get a new phone at the end of May.

How do I completely erase everything from it as if it was brand new?

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The easiest way is to reformat the sd card. Go under the phone settings and look for a phone and SD storage menu. There should be an option to format the card. If not, simply remove the card from the phone, place it in an adapter and format it from your computer.

You can completely erase your SD card data by performing "Format" operation. But data can still be recovered from the SD card using many data recovery software available on the internet. If you are looking to completely wipe SD card data, then you can use wipe disk software, which wipes your SD card's data completely, making recovery impossible. If you ever need this software then follow the below links